Short-period Rayleigh waves from near-surface events

Details Short-period Rayleigh waves from near-surface events Short-period Rayleigh waves from near-surface events

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pepi...10..369b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 10, Issue 4, p. 369-376.

Physics

8

Scientific paper

Short-period fundamental-mode Rayleigh waves (Rg) are generally well recorded by short-period seismographs within about 600 km of seismic events, such as explosions, rockbursts and earthquakes, which occur in the upper 3 km of the crust. Studies of these waves from records at the Swedish seismograph network revealed their usefulness to elucidate both path and source properties. They exhibit normal dispersion which requires a superficial low-velocity layer of about 1 km thickness, in part probably weathered and fractured granite. This layer has considerably higher attenuation than underlying more competent rock. The existence of Rg in regional short-period records is a reliable indication of shallow focal depth, and, provided adequate calibration is available, quite accurate depth estimation would be possible from the amplitude ratio of Rg to Sg1.

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